Image processing apparatus and control method thereof

a technology of image processing and control method, which is applied in the field of image processing apparatus and control method thereof, can solve the problems of image sharpness drop and s/n ratio drop, and achieve the effect of suppressing image quality drop

Active Publication Date: 2018-05-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively enhances image quality by suppressing noise amplification and maintaining sharpness, providing a more natural relighting effect that matches the characteristics of the virtual light source, thus improving the overall image processing outcome.

Problems solved by technology

However, increasing the gain amplifies noise components in addition to signal components, which causes a drop in the S / N ratio of the corrected area.
Japanese Patent Laid-Open No. 2010-135996 does apply a noise reduction filter in order to suppress a drop in the S / N ratio, but the noise reduction process is a smoothing process and can therefore cause a drop in the sharpness of the image.

Method used

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  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof
  • Image processing apparatus and control method thereof

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first embodiment

[0018]FIG. 1 is a block diagram illustrating an example of the configuration of a digital camera 100 according to a first embodiment of the present invention.

[0019]In FIG. 1, a lens group 101 corresponds to a zoom lens including a focus lens. A shutter 102 having an aperture function is provided between the lens group 101 and an image capturing unit 103. The image capturing unit 103 has an image sensor such as a CCD / CMOS image sensor, which converts an optical image formed by the lens group 101 on an image plane into electrical signals on a pixel-by-pixel basis. An A / D converter 104 converts an analog signal output by the image capturing unit 103 into a digital signal (image data).

[0020]An image processing unit 105 carries out various types of image processing on the image data output from the A / D converter 104, such as color interpolation (demosaicing), white balance adjustment, γ correction, edge enhancement, noise reduction, color correction, and the like.

[0021]An image memory 10...

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Abstract

Provided is an image processing apparatus capable of applying a pseudo-illumination effect to an image while suppressing a drop in image quality, and a control method for such an image processing apparatus. The image processing apparatus generates a correction signal for correcting sharpness of an image on the basis of illumination characteristics of the virtual light, and applies the correction signal to the image.

Description

BACKGROUND OF THE INVENTION[0001]Field of the Invention[0002]The present invention relates to image processing apparatuses and control methods thereof, and particularly relates to techniques for correcting the brightness and sharpness of an image.[0003]Description of the Related Art[0004]A conventional technique for correcting brightness (“relighting”) by illuminating an object in an image with light from a virtual light source is known (Japanese Patent Laid-Open No. 2010-135996). This technique makes it possible to brighten dark areas such as shadows produced by ambient light, which enables the image to be corrected so that an object present in blocked-out shadows, for example, can be discerned.[0005]In the case of relighting on a facial area, for example, an area having a lower luminance than an average luminance of the overall facial area is extracted as a shadow area and the brightness of the shadow area is increased, and as a result shadows in a facial area can be suppressed wi...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04N9/64H04N5/232H04N9/74H04N23/76
CPCH04N9/646H04N9/74H04N5/23229H04N23/80
InventorTAJIMA, KAORI
OwnerCANON KK